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Exposed-aggregate areas and photocatalytic efficiency of photocatalytic aggregate mortar.

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Title: Exposed-aggregate areas and photocatalytic efficiency of photocatalytic aggregate mortar.
Authors: Zheng, Li1 (AUTHOR) l.zheng@dundee.ac.uk, Jones, Roderick Martyn2 (AUTHOR), Yang, Lu3 (AUTHOR), Hakki, Amer3 (AUTHOR), MacPhee, Donald Elliot4 (AUTHOR)
Source: Magazine of Concrete Research. Aug2020, Vol. 72 Issue 16, p852-863. 12p.
Subjects: Air pollutants, Nitrogen oxides, Three-dimensional imaging, Titanium dioxide, Mortar, Catalyst supports, Nitric oxide, Ultraviolet radiation
Abstract: By having the potential to remove nitrogen oxide (NOx) air pollutants generated by vehicles and other anthropogenic combustion processes, particularly in urban areas, photocatalytic concrete has attracted significant commercial interests all over the world. In contrast to typical photocatalyst applications in concrete, in which titanium dioxide (TiO2) – the most utilised photocatalyst – is dispersed within the cementitious materials, the study reported here utilises titanium dioxide-coated aggregates. Used in an exposed-aggregate finish, this format aims to have a higher photocatalytic efficiency than titanium dioxide cement-bound materials. An exposed titanium dioxide-coated aggregate has the potential to provide a significantly higher proportion of catalyst to direct ultraviolet radiation and minimise lost performance due to occlusion. The exposed-aggregate surface area on the test mortar samples was measured with three-dimensional imaging techniques. Thereafter, photocatalytic efficiency was measured in comparison with that of the titanium dioxide cement mortar. The relationship between exposed area for photocatalytic reaction and photocatalytic efficiency was established. This indicated that the photonic efficiency increases with increasing exposed area, regardless of the method to support the catalyst – that is, either within the cement paste or externally mounted on the aggregate. The data confirm that exposing coated aggregate significantly enhances photonic efficiency. [ABSTRACT FROM AUTHOR]
Copyright of Magazine of Concrete Research is the property of Emerald Publishing Limited and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 144563443
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Exposed-aggregate areas and photocatalytic efficiency of photocatalytic aggregate mortar.
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  Data: <searchLink fieldCode="AR" term="%22Zheng%2C+Li%22">Zheng, Li</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> l.zheng@dundee.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Jones%2C+Roderick+Martyn%22">Jones, Roderick Martyn</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Lu%22">Yang, Lu</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hakki%2C+Amer%22">Hakki, Amer</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22MacPhee%2C+Donald+Elliot%22">MacPhee, Donald Elliot</searchLink><relatesTo>4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Magazine+of+Concrete+Research%22">Magazine of Concrete Research</searchLink>. Aug2020, Vol. 72 Issue 16, p852-863. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Air+pollutants%22">Air pollutants</searchLink><br /><searchLink fieldCode="DE" term="%22Nitrogen+oxides%22">Nitrogen oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Three-dimensional+imaging%22">Three-dimensional imaging</searchLink><br /><searchLink fieldCode="DE" term="%22Titanium+dioxide%22">Titanium dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Mortar%22">Mortar</searchLink><br /><searchLink fieldCode="DE" term="%22Catalyst+supports%22">Catalyst supports</searchLink><br /><searchLink fieldCode="DE" term="%22Nitric+oxide%22">Nitric oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Ultraviolet+radiation%22">Ultraviolet radiation</searchLink>
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  Data: By having the potential to remove nitrogen oxide (NOx) air pollutants generated by vehicles and other anthropogenic combustion processes, particularly in urban areas, photocatalytic concrete has attracted significant commercial interests all over the world. In contrast to typical photocatalyst applications in concrete, in which titanium dioxide (TiO2) – the most utilised photocatalyst – is dispersed within the cementitious materials, the study reported here utilises titanium dioxide-coated aggregates. Used in an exposed-aggregate finish, this format aims to have a higher photocatalytic efficiency than titanium dioxide cement-bound materials. An exposed titanium dioxide-coated aggregate has the potential to provide a significantly higher proportion of catalyst to direct ultraviolet radiation and minimise lost performance due to occlusion. The exposed-aggregate surface area on the test mortar samples was measured with three-dimensional imaging techniques. Thereafter, photocatalytic efficiency was measured in comparison with that of the titanium dioxide cement mortar. The relationship between exposed area for photocatalytic reaction and photocatalytic efficiency was established. This indicated that the photonic efficiency increases with increasing exposed area, regardless of the method to support the catalyst – that is, either within the cement paste or externally mounted on the aggregate. The data confirm that exposing coated aggregate significantly enhances photonic efficiency. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Magazine of Concrete Research is the property of Emerald Publishing Limited and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1680/jmacr.18.00441
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        Text: English
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      – SubjectFull: Three-dimensional imaging
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      – SubjectFull: Catalyst supports
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      – SubjectFull: Nitric oxide
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      – SubjectFull: Ultraviolet radiation
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      – TitleFull: Exposed-aggregate areas and photocatalytic efficiency of photocatalytic aggregate mortar.
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              Text: Aug2020
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